Answer:
A: Harriet Tubman contributed to the abolitionist movement in mostly unknown unrecognized ways.
Explanation:
Harriet Tubman worked as an abolitionist who helped slaves escaping from slavery at night time. She provided them refuge, food and guided them about their way.
Wile Frederick Douglass helped slaves openly during day times. He was a public speaker and an abolitionist.
In a reply (1868) to a request from Harriet Tubman that Frederick Douglass speak to her accomplishments, he wrote a letter telling her that her accomplishments in the abolitionist movement are far greater in importance than his. He says that he is appreciated by others and so gets a reward for his accomplishments, but she does not get any reward. He also writes that, he knows no such person who had willingly encountered more hardships and perils for such noble work.
So the main focus of the letter is on Harriet Tubman's unrecognized and unknown contribution to the movement.
